package com.loop.netty.simple;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * @author zhangxiaolu
 * @since 2023-09-10 22:36
 */
public class SimpleNettyClientHandler extends ChannelInboundHandlerAdapter {

    // 当通道就绪就会触发该方法
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("客户端通道激活了 ctx：" + ctx);
        // 发送消息
        ctx.writeAndFlush(Unpooled.copiedBuffer("你好，我是客户端", CharsetUtil.UTF_8));
    }

    // 当通道有读取事件时触发该方法
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf) msg;
        System.out.println("客户端收到消息：" + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器的地址是：" + ctx.channel().remoteAddress());
    }

    // 发生异常时触发该方法
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("客户端异常了");
        cause.printStackTrace();
        ctx.close();
    }
}
